linux-kernel - Re: [RFC PATCH 6/6] sparc64: Enable 64-bit DMA

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Date:   Tue, 11 Oct 2016 12:42:06 -0700
From:   tndave <tushar.n.dave@...cle.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     davem@...emloft.net, chris.hyser@...cle.com,
        sowmini.varadhan@...cle.com, vgupta@...opsys.com,
        robin.murphy@....com, jroedel@...e.de, egtvedt@...fundet.no,
        krzk@...nel.org, sparclinux@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 6/6] sparc64: Enable 64-bit DMA



On 10/11/2016 09:38 AM, Christoph Hellwig wrote:
> Hi Tushar,
>
> On Fri, Oct 07, 2016 at 01:09:15AM -0700, tndave wrote:
>> With change made by patch 6/6, dma_addr_t is always 64-bit, no matter if
>> device DMA mask is 32-bit (i.e. using existing IOMMU) or 64-bit (i.e
>> using ATU)
>
> But only iff CONFIG_ARCH_ATU is set.  Anyway, I'll wait for your patches
> to got in first and will then propose getting rid of
> CONFIG_ARCH_DMA_ADDR_T_64BIT separately.
CONFIG_ARCH_ATU is by default set on 'SPARC64'. Therefore
CONFIG_ARCH_DMA_ADDR_T_64BIT is also always set as well on SPARC64.

-Tushar
>